Studies on the Self-and Cross-incompatibility in Sweet Potato : V. On the flowering and seed setting of the self-compatible varieties and their selfed progenies

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We studied on the number of flowers and the self-and cross-compatibility of the self-compatible varieties and their selfed progenies S1 and S2. The percentage of the capsule-set by self-pollination was 89.9% at the maximum, 16.2% at the minimum and 49.7% in average of 18 self-compatible varieties. These percentages are very high as compared with the known self-compatible varieties. The number of flowers decreased in selfed generation with the exception of some lines and it was also observed in selfed generation that the percentage of the flowers which had the abnormal shape and size or which had the degenerated anther was increased (Table 1). The self-fertility also decreased in selfed generation. The average percentage of capsule-set by self-pollination in the S1 or S2 lines were generally less than a half of the each preceding generation S0 (parental variety) or S1 lines. (Table 1). All S1 progenies of the varieties "Motokajiya", Norin No. 7 and "Norin No.1" belonged to the group B, C and the other group except A, B and C, and we could not find any line which belonged to the group A. Self-compatible varieties hitherto known are all belonged to B group or to the group other than A, B, and C. But in this study we could find out some self-compatible lines which belong to the group C for the first time (Table 3) The matings among the self-compatible varieties and their selfed progenies were almost compatible. (Fig. 1)
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